Reduction gearing



Dec. 23, 1930. c. L. HAwEs 1,786,158

REDUCTION GEARING Filed Dec. `1, 1927 s sheetssneet- 2 I N VEN TOR.

' A TTORNE ifisesa c. L. HAwl-:s-

REDUCTION GEARING De@ 23, i930.

Filed Dec. 1, 1927 5 Sheetsf-Sheet. 3

. INVENTOR. (f2/MHK@ LJ@ wes Qing, M r @Qw/ ATTORNEYS,

Patented Dec. 23, 1930 N N' UNITD STATE.Si'Pflfli-INYTortica CHARLIE L. HAWES, OF ASHTAB'ULA, OHI

REIDUCTION GEARING Application filed December 1i, 1927.' Serial I\To. 23 (`i,897. v

' The present invention, as. indicated," Ife-A lates to reduction gearingand the objects ofl the invent-ion are to provide such a mechanisin in' which a very hi Oh reduction maybe obtained with small power-loss and withV relatively few parts, and in which all of the parts are enclosed in a relatively small housing.l To the a'c'complishment of the foregoingV i and related 'ends,said invention, then, consistsof the means hereinafter fully described` and particularly pointed out inthe claims.

'The' annexed` drawings and the lfollowing description set forth in detaillcertain mechan nismenibodying the invention, such` disclosed means; constituting, however, but one of va-` rious niechanicallfo'rms in which the principle' of theinvention may be used. Y

"In saidvannexed drawings A Fig. `1,is a broken side elevation partlyin section ofene form of the present invention;

Fig.'2 is an axial section of'another'form ,of the inventionyFig.v 3' is a transversesection on the line 3- 3in Fig. 1; Fig. 4 isa transverse sectionorl the line in F ig; 2; Fig. 5 is a fragmentary "section showing another modification; and Fig. 6 is a section taken on a plane indicated by the line 6 6, Fig. 5 with the shaft pinion removed.

' l yReferring incre particularly to fF/ig. 1,`the reference numeral lindicates generally an electricrnotor having shaftAv or spindle l 2 and an endframe 3 provided with an annular' laterally' projecting' skirt 4. A'cover plate 5 is provided to form with said skirt Van enclosed housing,and.said cover'plate is secured to said skirt' bymeans of screws 6V or other equivalent;fasteningfmeans. Y

i z Keyed rosati Shaft 'e andwahia erstens-' ing# are A two pinions7 and 8, these being spaced apart on shaft 2 by a spacing ring 9.*v As illustrated, the pinion7 is shown of larger diameter .than the, pinion8, ,butit will be un-V derstoodthat in'any given case the particu- Thepinions are .held againstpo'ssijble move'- ment longitudinally ofthe shaft by Vmeanslof a nutlOthread'ed onto a screw threaded porlandiameters and ratios will depend upon the particular speed requirements in hand.v

are secured in position byfmeans of nuts 14 n tionsl ofthe stub shafts12 and, as is clearly shown in Fig. '1,said idler pinions mesh with oppositesides of the'sh'aft pinion.` 3 A disk 17 having 'a diameter substantially equal to the insidey diameter of the housing isinounted for rotation in said housing and. bears .against-the inner .face of the .coverl plate .5." Said disk 17 is provided with a lateralprojection 18 extending from its outer faceand journaled in an aperture 19 in the coverplate 5. Beyond the cover plate 5 the extension 18 may be reduced, if necessary, as' at 20, for the reception Vof a belt or pulley, gear or'coupling, or other appliances, for re` ceiving power. The extension 18 is provided with'a bore 2 1lin`which is mounted a bushing 22, and the reduced end 23 Vof the shaft 2` is journ-aled in said bushing 22.

The disk 17 carries yonitsinner faceA atV d' t ll d t 7- Liarnetrica y .oppose vpoints one or more lar internalgear 26 is journaled inthe housing,fits external diameter being sub'stantially equal to the internall diameter of the housing, and said gear ,is held against lateral movement betweentheinner wallv ofthe housing and thedisk 17. The gear 26 is provided with twoftoothed paths 27 and 28 for engagement with the idler vpinions 16 and 2 5 respectively, the pitchesandzdiametersof the various ele-` inentsin any given case beingzdeterniined by the particular speed requirements. A bearing v29, preferably of ball or `roller type, is provided between `theshaft 2 and the hous ing. Y

In the operation of the device, the motor 1 rotates the shaft 2 which in turn rotates the pinions 7 and 8. The pinion 7 Arotates the idler vpinions 16 which in turn transmit the power to the annularinternal gear 26 through the teeth 27. Thus, if the shaft`2 is rotatedV in a clockwise direction vas seen from the right of Fig. 1, the Vgear 26 is rotated in a counterclockwise direction at a reduced rate of rotation. Rotation of the gear 26 causes consequent rotation of the idler pinions 25, and since these are in mesh with pinion 8 which travels with the shaft 2, the hubs 24 and with them the disk 17 receive a motion in translation or creep around, as determined by the differential between the pinion and the pinion 8. According to the particular diameters and speeds of the various elements, the extension-hub 2O may in such manner be rotated at a desired rate and in a desired direction.

In the construction illustrated in Fig. 2, the shaft 2 is journaled in a casing made up of end members and 31 connected by means of bolts 32 or similar elements and which may be spaced from each other by a plate 33 and a. large spacing ring 34. Pinions 7 and 8 are keyed to the shaft 2 and are spaced longitudinally of the shaft by means of a spacing ring 9.

The plate 33 is rigidly held in the housing and is provided with apertures 13 on opposite sides of the shaft for the reception of stub shafts 12 held in position by means of nuts 14 and enlarged portions 15 within the housing. The enlarged portions 15 carry one or more idler pinions 1G in mesh with the larger shaft pinion 7.

A rotatable disk 17 is mounted in the housing and is provided with a cylind 1ical projection 18 extending from the outer face thereof and journaled in any suitable bearing, as a ball-bearing or a roller-bearing, or for example a bushing mounted in the portion 36 of the end plate 31. The extension 18 may be. formed with a cylindrical recess 37 for the reception of a bearing or a busl ing 38 in which is journaled a reduced extension 39 of the shaft 2.

rlhe disk 17 carries one or more stub shafts 4() in apertures 41, said stub shafts being held in position by nuts 42 and enlarged portions dlerpinions 25 are carried on the enlarged portions 40 in mesh w`th the shaft pinion 8. An annular internal gear 26 is journaled in the housing, the external diameter of said gear being substantially equal to the internal diameter of the spacing ring 34, and said gear 26 is held against lateral movement between the plate 33 and the disk 17. rlhe gear 26 is 'provided with two toothed paths 27 and 28 in mesh with the pinions 16 and 25 respectively.

The operation of the device disclosed in Fig. 2 is identical with that of the device disclosed in Fig. 1 except that power is applied to the shaft 2 by means of some external power source through a belt, a chain, or a train of gears or coupling.

In the form shown in Figs. 5 and 6, the motor shaft 2a mounted in any suitable bearing 29a carries a pinion 43 which is in mesh with pinions 44, 45, which in turn are mounted on stub shafts 4G held in the end frame 3a.

A disk 17a is journalled in a cover plate 5a by a` gudgeon projection 18a. Pcripherally, the disk member 17a carries an internal annular gear 47 which is in mesh with the pinions 44 and 45. With this construction, as the motor shaft with its pinion 43 rotates, the pinions 44, 45 are rotated, but these being mounted on fixed axes exert a turning movement on the ring gear 47 and thus to the projection or extension hub 18a which may carry any desired member to be rotated. The particular gear ratios in any instance will depend upon the drive rate required.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means statedby any of the following claims or the equivalentof such stated means be employed.

I therefore particularly point out and distinctly claim as my invention 1. A. power transmission unit comprising a housing, a shaft journalled in said housing, pinions of unequal pitch diameters fixed on said shaft, a pinion mounted in said housing for rotation about a fixed axis and meshing with one of said. shaft pinions, a disk provided with a cylindrical projection from one face thereof, said projection being journallcd in said housing and upon said shaft, a pinion carried by said disk in mesh with the other of said shaft pinions, said disk and housing pinions having unequal pitch diameters and an internal annular gear having its periphery journalled in the internal surface of said housing in mesh with said fixed pinion and with said disk pinion, said disk having its peripheral portion located between said housing and said annular gear and maintaining said annular gear in longitudinal position in said housing.

2. A power transmission unit comprising an electric motor having a stationary housing, a shaft journalled in said housing,`a pair of pinions of unequal pitch diameters keyed to said shaft, a pinion mounted in said housing for rotation about a fixed axis and meshing with one of said shaft pinions, a disk provided with a cylindrical projection from one face thereof, said projection being journalled in said housing and surrounding` said shaft, pinions carried by fixed hubs on said disk in mesh with opposite sides of the other of said shaft pinions, and an internal annular gear having its periphery journalled in the internal surface of said housing in mesh with said fixed pinion and with said disk pinions, and having its one peripheral side in sliding contact with said 'disk and its other peripheral side in sliding contact with said housing. Y 3. A power unit comprising thercombination with an electric motor including a shaft and having a skirt projecting from one end frame thereof concentric with said shaft, of

hub pinions;

a cover plate forming, with said skirt, a housing, a pair of pinions keyed to said shaft, a

pair of pinions carried by said end frame and positioned in said housing in mesh'with one of said shaft pinions, a diskY mounted in said housing and provided with a cylindrical projection from one face thereof, said proj ectionA being journalled in said cover plate, said cover plate axially restraining 'said disk, a air of pinions'carried-by said diskin mesh with the other of said shaft pinions, andan internal 'annular gear having its periphery journalled in the internal surface of said skirt and having two tracks, one meshing with said housing pinions and the other Vmeshing with said disk pinions, said disk axially restraining said annular gear.

4. A power unit comprising the'combination with an electric motor` including a shaft and having an integral skirt projecting from `one end frame thereof concentric withsaidshaft, of a cover plate forming, withsaid skirt, a housing, a pair of pinions of different diameters keyed tol said shaft and spaced longitudinally thereof, a 'spacer ringon said shaft between said pinions, a pair of stub shafts in said end frame and projecting into said housing on opposite sides of said shaft, l

pinions mounted onsaid stub shafts in said housing and meshing with the larger of said shaft pinions, a disk in said housing and having a cylindrical projectiony extending from one face thereof, said projection being j ournalled in said cover plate, said projection being formed with abore, a bushing in said bore, said motor shaftfbeing journalled in saidwbushing, a pair of hubs projecting from the opposite face of said disk, pinions mount` ed on said hubs and meshingfwith the smaller of said shaft pinions, and an annular internal gear journalled in said housing and held against lateral movement therein between said end frame `and said disk and meshing Y with said' stub shaft pinions and with said Signed by Ine this 28th day of'NoVember, 1927. l

CHARLIE L. HAwEs. 

